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Current values used as signals from digital transmitters
Fault- mA Value (F)
F = 1
0
3.6
4.0
3.8
Whenever the local situation allows, the zero adjustment and the full scale can be set
using the push-button feature and the appropriate menu selection. In most cases it is
possible to do a one point calibration
in %.
The total isolation between the measurement circuit and the current- loop circuit
provides immunity during the use of cathode protected measuring tanks. Connection to
PLC equipment is possible without any difficulty.
•
The Upper Range Value (URV) and Lower Range Value (LRV) should be within
the USL to LSL range, but can be set anywhere within that range.
•
An interruption of the measuring connection will be detected: a loose or
interrupted connection results in up to 0.5 pF capacitance, which is below the
adjusted LSL and thus signals a FAULT condition.
Applications for Solid-state Output
The solid-state output is a polarity independent switch output. The solid-state switch has
two possible functions.
•
it can be activated/deactivated when the product level reaches the upper/
lower threshold settings (set in menus 15 and 16)
•
or it can be activated if a fault or failure is detected
See page 102 for an illustration of a typical application using SITRANS LC 500 as a level
indicator, with the solid-state output connected to a relay which activates a pump.
The solid-state switch has its own parameter set: menu items 13 to18, (see
00 to 0F and 10 to 1F
page 41).
In menu 0E and menu 0F, you set the Upper and Lower Range Values (URV and LRV) for
relay operation. Within that range, the solid-state switch has independent settings for
1.
Calibration using push-button adjustment
See
2.
Fault Signalling
See
7ML19985GE04
Current values for signal detection
Measurement value
F = 0
1
by using the push-buttons to input the actual level
Rotary Switch Positions – Quick Reference
on page 37, and
on page 16 for details of fault conditions.
SITRANS LC500 – OPERATING INSTRUCTIONS
Fault- mA Value (F)
20 22
20.5
2
(set in menu 18)
on page 43.
F = 1
mA
Menu Levels
chart on
Page 35
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